Lamp casing



Patented ug. 28, 1923.

erase CROIWELL A. B. HALVORSON, JR., OF LYNN, MASSACHUSETTS, ASSIGNOR TO. GENERAL ELECTRIC'COMPANY, A CORPORATION 0F NEW YOR-K.

i LAMP CASING.

Applicatonfiled June 29, 1921. Serial Y110.481,385.

To all 107mm t may concern.' Y Be it known that I, CROMWELL A. BgHAL- vonsoN, Jr., a citizen of the United States, residing at Lynn, in the countyof Essex, State of Massachusetts, have invented certain new and useful :improvements in Lamp Casings, of which the following is a specification. y l

My invention has reference to lamp casings. More specifically, it relates tocasings for supporting lampunits on top of standards. y f

An object of my invention is toprovide a simple unit of this character made of an insulating' material, such as porcelain, thereby eliminating numerous parts Vheretofore employed to insulate the lamp from the standard, Vand thereby greatly simplifying the construction of the electrical connection for the lamp. l

Another object of my invention is to provide a rugged lamp casing, capable ofV carrying the necessary weight, which is not easily broken, and which may withstand the elements indefinitely without deterioration or impairment of its eiiciency and ornamental effect.

In the accompanying drawings, Fig. 1 is an elevation of my lamp casing, shown partly in vertical section, with one type of lamp socket and with the means for-securing the casing to the standard illustrated. Fig. 2 is a top view of the securing ringand Fig. 3 is an enlarged detail view of Fig. 2.

Referring to the'drawings, the numeral 10 indicates a lamp casing made of insulating material, preferably porcelain. vAt its base the casing is provided with an Xternal flange 11 which serves as a securing means to a standard 12 as will appear hereinafter. The top of the lampcasing is of larger diameter than its base, and is formed with a suitable ledge 111 on which the lamp globe, not shown in the figure, may be supported in the usual manner.

The casing 10 is formed with two chambers 15 and 16, which are separated bya wall 17 substantially at right angles to the axis of the casing and integral with the casing. The chamber 16, which is located on the top side of the wall 17, that is, at the enlarged end of the casing, houses a lamp socket 18, or any other suitable type` of electrical connection for the lamp. The chamber 15, which is on the lower side of thereby eliminatinff supporting members.

the wall 17,-houses the electrical terminals for the' socket and forms au passagewayfor` the'leads thereto, notshown in the vdrawing. The particular type-of lamp r`socket' 18 illustrated forms no part of my lpresent invention, since lany suitablesocket may be employed to cooperate with the lamp unit used. simplicity of construction of `the lamp socket-and itsconnections in my lamp. casing, in which the casing itself insulates theV several socket vmembers and supports them,

g separate insulating and The wall 17 is formed with an elevated circular platform 19 in the chamber l16, having a slot 20 on a diameter thereof. rlhe socket receptacle 21, which is provided with suitable bayonet slots 22, is rigidly secured on the platform 19 by screws 23 and 211,. shown in broken lines in Fig-1.` The screw- 24,4 forms a part of one side of the electric Howeventhis socket illustrates the.V

circuit for the` lamp, and at one end isin Velectrical contact with the receptacle 21.

place by a nut 25, which is machined to form aV terminal. The other side of the electric fcircuit in the .socket consists of a screw 26, extending through the wall 17, having a nut 27, similar to nut 25,\in the chamberl, and securelyv holding a flexible conductor 28 in the slot20. The conduptor 28 is made of a flat strip of copper whichis doubled on itself, and supports a Contact 29. The. contact 29 has astem 30 extending into a hole in the wall 17 located in the axis of the lamp and the contact29 and conductor 28 are normally urged into the receptacle 21 by a spring 31, surrounding the stem 30, and seated in a thim'ble 82. Y The terminals 25 and 27 are each respectively provided with suitable openings 88, 84; and screws 35, 36 for securing the electric circuit leads thereto. The casing 10 is provided with suitable drainage openings 37(1eading from the chamber 20.

The standard 12 is provided with a flange 38 at its top, similar to the `flange 11 on casing 10, lwhich forms a shoulder on'which the lamp casing 10 rests when mounted on the standard 12. The casing is secured iu this position by a clamping ring, which consists of two semi-circular members 39 and i 40, which are internally machined to fit' over the flanges 1l and 38 as shown in Fig. l. r)lie members 39, 40 are hinged to each other by a bolt all, the members being cut and fitted as shown in Fig. 3. At their free ends, the members 39 and 40 are respectivelyv provided with lugs l2 and e3. A screw bolt le extends through these lugs, by means of which the members 39 and Ll() are caused to clamp the casing tothe standard in a manner readily understood.

While l have `described myinvention as Vembodied in concrete-*form in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention thereto, since various medihcationg thereof will suggest themselves to those skilled in the art without departing 'Y from the spirit of my invention, the scope oV which is set forth in the annexed claims. l/Vhat I claim as new and desire to secure vby Letters Patent of the United States,`is:

l. In a highway light unit fixture, a lamp casing formed of insulating material having an upper anda lower inner chamber, a wall separating the two chambers, a lamp socket in the upper chamber supported by said wall and insulated thereby, and electric terminals extending through said wall into the lower chamber, the upper part of said casing formed into a holder for supporting a globe and a drain duct extending from the socket chamber through the wall of the casing.

2. ln combination, a lamp casing formed of insulating material having an upper and a lower inner chamber, a wall separating the two chambers, a lamp socket in the upper chamber supported by said -wall` and insulated thereby, electric terminals extending through said `wall into thelowerchamber, a standard, and a clamping ring for securing the casing to the'standard.

ln witness whereof, I have hereunto set my handthis 25th day oitdune, 1921.

camerieri.Y A. s. renverser, kif. 

